Pressure-cooker lock



Dec. 19', 1922: Lmwm .l. H. JACOBS.

PRESSURE COOKER LOCK.

FILED AUG.3, 1921. 2 SHEETSSHEET 1.

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PRESSURE COOKER LOCK. FILEQAUG-S. 1921.

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Patented Dec. 19 1922.

JOSEPH H. JACOBS, or DENVER, 'coLoRAno.

PRESSURE-COOKER LOCK.

Application filed August 3, 1921. Serial no. 489,t)2.

To all who mat may concern: Be it known that I, JOSEPH H. JAooBs, a "citizen of the United States, residing in the city and county of Denver and State of Colorado, have inventedcertain new and useful Improvements in Pressure-Cooker Locks;-

' and I do declare the following to be a full,

' which the cover clear, and exact description of the invention,

such as will enable others skilled in the art,

to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of -reference marked thereon, which form a part of this specification.

This invention relates to the art of pres-l sure cookers and has special reference to means for locking the cover to the pot.

In pressure cookers it is customary to secure the cover to the pot by means of a plurality of bolts attached to lugs on the upper outer edge of the pot and engaging between spaced lugs carried by the cover: the

bolts being provided with winged nuts by' is forced against the .pot. The above described securing means is open to several objections among which may be mentioned-that when the pot'is cast with lugs the unequal cooling tends to throw the pot out .of round and then the lugs arein the way when polishing, besides the aboveit always entails considerable labor to tighten.

and loosen six or more bolts every time the cooker is closed and opened.

It is the object of my inventionto overcome the objections pointed out above and I have invented fneans for securing the cover to the pot that .does not require the pot to be made with lugs but instead with a' dircular outwardly projecting flange which prevents unequal cooling and which doesnot interfere with the finishing. 'I have also invented aclamping means" that cooperates with the flange and which comprises a plurality p of flange engaging hooks that can be operated simultaneously.

- In order to more clearly describe my invention I will refer tothe accompanying drawings in which Fig. 1 is a side elevation of my improved cooker. g

Fig. 2 -is 2-2 Fig. 3.

Fig. 3 is a top. plan view of my cooker with a part broken away.

a partial section taken on line acters will be used to designate the same parts throughout the several views.

Numeral 1 represents the pot part of my improved cooker the same being provided on its bottom with an annular downwardly pro ecting flange 2 upon which the pot rests when standing on a plane surface. Around the upper edge of the pot is an outwardly projecting flange 3, the purpose of which will hereinafter appear. The inner upper edge of pot 1" is beveled as shown at 4 in Fig. 2. Cooperating with the pot is a cover 5 provided with a downwardly projecting flanged portion 6 whichhas its outer surface beveled to conform to the inner beveled portion 4. of the pot. The cover is arched up wardly, as shown, and on the central portion thereof I have provided an upwardly projecting tubular member 7 provided near its bottom with three equidistantly spaced slots 8. The upper portion of the tubular member 7 is internally threaded to receive the threaded tubular plug 9 which has secured to the lower .end thereof, by means of screw threads, or otherwise, a plug 10 having shoulders 11 engaging the lower end of tubular member 9 and its spherical end 12 engaging a disk shaped member 13. To

prevent plug 9 from being withdrawn from the tubular member 7, I provide one or screw threaded portion, which is of larger diameter.

For the purpose of securing the cover to the pot member I have provided the following means. At an even number of equidistant oints around the periphery of the cover I drill holes15',which, however, do not extend entirely through the metal. Holes 15 are then tapped. Into tapped holes 15 I insert pivot supporting plugs 16 which comprise short plugs of any suitable cross section having one end screw threaded to engage with the threads in holes 15, the otherend being provided with a transversely cut notch 17 the sides 18 of which have opposed holes 19 for the reception of a pivot pin '20. Pivoted on each of said pins 20 is a lever 21 other opening for the reception of pin 24. tension 50 which The inner ends of each group oftwo levers of flange 3, when the bail is on one side. By-

21- and 25 which receive pins to the outer end of which is pivotally at hooked beneath projection 40 and when a" 'tached a'hook 22 of suitable shape and size small pressure is suflicient it is moved up to engage with the flange 3. The *innerend against projection 41. A collar 47 or other of lever 21 is bent, as indicated at'22 and equivalent means prevents pin 43 from drop- "provided with an opening for the reception ping out of lever 37. The pot member 1 is pin 23. Between the pivot. and the provided witha bail 48 which is pivoted to bent end 22,- lever' 21 is provided with aneyelets 49. One

engages with the lower side are brought towards each other until eachthis means the bail 48 can be held out of con-.

end of said bail has an ex- I contacts with a side of bar .which has one. tact with the pot: and kept comparatively end inserted within a slot 8 in-the tubular cool. 0

member 7 and is provided with holes for the The operation of my device is as follows:

reception of pins 23 and 24, all as clearly When it-is desired to apply the cover'to the shown in Fig. 3. 23 and 24 pass pot, member 32 is turned and tubular .memthrough the two levers 21- and the bar 25 her 9rotated in a direction to move the same and are provided at their ends with-holes upwardly. Washer carries the inner ends and cotter pins 26. The holes in members 27 of bars 25 upwardly and causes the outer larger inwdiameter than the pins: thisper-r wardly. Hooks 22 are usually thrown upmits relative movement between the several .wardly and inwardly-on levers 21 until the members of the assembly for a purpose cover is put .in place, the hooks are then which will hereinafter appear.

24 and 25 are endsof levers 21 andhooks'22' to move downturned downwardly and hooked underneath The inner ends of levers'25 which project flange 3. -Tubular member 9 is now rotated through the slots 8, have their ends rounded in adirection to move it downwardly, this i as 'indicated at 27. The lower edge 28 of causes the dish-shaped member 28 to move Pl g 9 is'provided with ahand grip 32 whereby P 'm yb 'rotated.

"through a hole in plug 10, extends -member 13 and projects below the lower wardly and engage the under surface of have described only one of them.

The cover is provided with the usual presadjustment of these members that the two sure gage 33 andwith a safety valve 34 hookswill finally engage the flange surface upper end Slot 39' is provided with two projections stops and 41 ag dished member 13 engages the upper curved the ends 27 of bars 25 downwardly and rosurface' of bar ends 27. K screw 29 passes tat'e levers 21 about pivots 20 in such a through direction that the hooks 22 are carried up curved surface of ends 27 where it supports flange 3. When the hooks engage the lower awashe'r 3 0 againstthe curved surfaces 27. surface of flange '3 any further movement A spring 31 is provided between the head of screw 29 andthe top of plug-i10 for the pur; the pot with a force equal to the total force pose of yieldingly holding washer 30 exerted by tubular member}? on the ends of against surface 27. The upper end of 'tububars 25 multiplied by the lever arm ratios, and can naturally be made'as great as may be desired, within reasonable limits. If for There are half as many assemblies of any reason the adjustment should be such levers 21 and bars 25 as there are pivot supthat one hook of a pair engages before the porting plugs 16 but as they "are all alike, I other, then the loose connection between bar .25 and levers 21 willpermit such relative which is shown in; section in Fig. 4. Safety with substantially equal force. If the relavalve 34 comprises two projecting portions tive adjustment of the various. sets or assem- 35 and 36 whose upper ends are slotted to reblies is different the dishhaped member 13 ceivea lever 37; a pin.38 passes through :the will pivot on the spherical end 12 of plug Of projecting portion 36 and 10- so as to equ'ahze: the pressure exerted by forms a ,pivot for the l'ever'37 whose other each setf In the manner pointed out, each end is movable in slot 39 of projection 35. hook of a set exerts substantially the same or force and each set exerts substantially the ainst which lever 37 .ensame force thus assuring a uniform presgages. A hole 42 extendsthreugh the cover sure radially distributed. Where bolts-are between projecting portion 35 and 36. A used, there is no way of telling when the pin 43 has a spherical or semi-spherical head pre sure exerted by each bolt is the same.

44 which engages in the hol 42. A ring I now desire to call attention to an impor- 45 whose lowergend rests upon a washer 46 taut feature of this locln'hg means; namely,

and whose upper end engages with lever 37 that when it is desired to remove the cover holds the spherical head resiliently against the pressure 1s released equally at each hook, the upper edge of hole 42 and closes the this 15 important for the reason that it often same steam tight. Should the pressure behappensthat an attempt 13 made to open the come' excessive it will compress spring' 45 cover without first removing the pressure sli htly and permit the steam .to escape. and where the steam-pressureis high, dam- Wfien full' pressure is desired '1ev'er'37 is age of serious consequen is liableto-occur will cause the cover to be pressed down onto same, what I claim is:

if the cover is loosened at one side more than at the other. With my device the pressure is reducedequally at each place and when it is sufliciently released to permit the steam to escape it will do so around the entire circumference' It is not my intention that the covershould ever be removed While the pressure is excessive but with my device it can be done without any serious results.

Although I have shown and described a lock having six hooks engaging with the flange of the pot, it is obvious that I can use three only, in which case I will not employ the bars 25 but project the ends of the three levers 21 within the tubular member 7 where they will be directly engaged by the disk shaped member 13. This combination is to be used in cookers of the smaller sizes.

Having now described my invention or discovery and the best manner in which I contemplate constructing and using the 1. In combination, a container whose upper edge is outwardly tapered, an outwardly extending annular flange surrounding said container adjacent the top thereof, a cover having a tapered portion adapted to co-operate with the tapered portion of said co n-.

tainer to form a steamtight seal, means .for clamping the cover to the container, comprising a [plurality of lugs equidistantly spaced about the periphery of said cover, levers pivotallf attached to. said lugs, the

outer ends of said levers being provided with hooks adapted to engage beneath said flange, a central tubular stem on said cover, a plurality of slots in said stem adapted to receive the inner ends of said levers, said stem being internally threaded, a bolt threadedly connectedwith said stem and adapted to co-operate with the ends. of the levers to move the same about the pivots and clam the cover in place. J

2. n combination a container, a cover removably secured-thereto, a. flange on said container, a plurality of pairs of levers pivotally mounted on said cover, hooks pivotally secured to the ends ofsaid levers, said hooks being adapted to engage the lower side of said flange, the levers of each pa1r having their inner ends inclined towards I 'said ,lever and adapted to engage said ends of said bars downwardly and forcing the hooks upwardly against said I flange whereby the cover is forced against the top of said container.

3. In combination a container, a cover removably secured thereto,, a flange on said container, three pairs of levers pivotally mounted on said cover, hooks pivotally secured to the ends of said levers, said hooks being adapted to engage the lower side of said flange, the-levers ofeach pair having their inner ends inclined towards each other, a bar pivoted intermediate its ends between the inner ends of each pair of levers, a pin passing through said pair of levers and through the outer ends of each of said bars and means for moving the inner ends of said bars downwardly and forcing the hooks upwardly against said flange whereby the cover is forced against the top of said container. 4 r

4. In combination, acontainer, a cover removablysecured theretoIa flange on said container, three 'pairs of levers pivotally mounted onsaid cover, hookspiv'otally se cured to the ends of said levers, said hooks being adapted to engage the lower side of "said flange, the'levers' of each pair having their inner endsinclined towards each other, a bar" pivoted intermediate its ends between the inner ends of each pair of levers, a pin passing through each pair of levers and-- through the outer end of each of said bars, a tubular member secured to the covernear its center and projecting upwardly therefrom, slots in said tubular member, the inner ends of said bars projecting through said slots to the hollow space within said tubular member and means within said tubular member for moving the ends of said 'movably securedv thereto, a flange on said container a central tubular stem secured to the cover, saidstem being internally thrdaded, threaded bolt-like member co-opera:

tively connected to said stem, at handle-se-' cured to said bolt; and adapted to rotate'the same, a plurality of slots in the lower por tionof said stem, a plurality of lugs se 'cured in spacedrelation about the periph ery of said cover, a lever pivotallymounted on each lug, a hook on the outer end of flange, and means extending through said slots and adapted to be engaged by said bolt container. r

' In testimony "whereof I aflix signature.

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